body{
margin:0;
padding:0;
background-color:black;
}

#streamStage{
position:fixed;
top:0;
left:0;
width:100%;
height:100%;
background-color:#fff;
}

#streamStage:before {
content: '';
box-sizing: border-box;
position: absolute;
top: 50%;
left: 50%;
width: 2rem;
height: 2rem;
margin-top: -1rem;
margin-left: -1rem;
}

#stream{
max-height: 100%;
max-width: 100%;
margin: auto;
position: absolute;
top: 0; left: 0; bottom: 0; right: 0;
}